ROSA Linux Bugzilla – Bug 1250
Backlight/Brightness doesn't work on Packard Bell EasyNote TE11HC-B8302G50Mnks
Last modified: 2015-04-03 10:20:03 MSD
Description of problem:
The FN-F11 and FN-F12 combinaisons doesn't work to adjust brightness of screen.
When you push this combinaisons nothing happens.
Version-Release number of selected component (if applicable):
Rosa Desktop 2012 RC and Rosa Marathon LTS
boot the computer and try to adjust brightness
Steps to Reproduce:
1. boot the computer
2. when your are in your session try to set brightness up or down with FN-F11 or FN-F12 combinaisons
3. nothing happens
To have a functionnal brightness adjustment you need to put acpi_osi=Linux acpi_backlight=vendor on the grub line with mcc.
After a reboot all is ok, you can set brightness up or down with button combo.
Could someone please make it automatic or perhaps there is a bug?
Created attachment 923 [details]
Created attachment 924 [details]
Created attachment 925 [details]
Hello, i can confirm that the bug is also present with the final release of Rosa fresh.
It's not be automate because this is custom solution. Only in FAQ or Errata...
Grub line for common users will be empty and one solution - use udev detect rules and fix this in kernel (grub transfer kernel this params). For some reason both not implements :(
Thanks for the answer. So it cannot be automated and perhaps it needs to be implemented/corrected directly in the kernel?
Is there a way to report it to upstream or could someone can do it for me please?
How can i add the workaround information on the errata page?
It can be usefull for other users that doesn't know this solution for this computer model and other acer laptop.
For me it is not a problem because i know what to do but for other users it can be a problem.
I have see that a lot of linux distributions have this "problem".
The only negative point is that if you can't adjust brightness you loose battery autonomy faster but it not a blocking bug.
You may register on our wiki (wiki.rosalab.ru/en) and add information in ERRATA page.
Hello, i have edited the wiki page. If something is wrong could someone please correct it?
Thanks a lot, I've only fixed a typo and usage of French words instead of English ones:) And translated this note to Russian.
I set to wontfix because it's a mainstream bug, a workaround exists and i added it to wiki but Rosa and other distribs can't fix it for the moment.
Please, make a probe of your PC: http://wiki.rosalab.ru/en/index.php/Blog:ROSA_Planet/ROSA_Hardware_DB
Does the problem with brightness keys still persist in ROSA R5?
here is the probe result:
The problem with the backlight management seems to be solved by using linux kernel >3.16
I tried some systems with this kernel and there is no problem anymore.
With kernel > 3.16 it's not necessary to add acpi_osi=Linux acpi_backlight=vendor to the grub line. It works out of the box.
With Rosa Fresh R5 the problem is still present. (try with the latest iso in usb mode)
(In reply to comment #14)
> The problem with the backlight management seems to be solved by using linux
> kernel >3.16
> With Rosa Fresh R5 the problem is still present. (try with the latest iso in
> usb mode)
Thanks for letting us know!
Meanwhile, if you have ROSA R5 installed on that laptop, could you try kernel 3.18.9 there and see if it works out-of-the-box too?
You may also need to update broadcom-wl as the current release does not build with kernel 3.18.
Here is how to do all this (as root):
urpmi.addmedia kernel-3.18 http://abf-downloads.rosalinux.ru/kernels_3_18x_personal/repository/rosa2014.1/x86_64/main/release/
urpmi.addmedia broadcom-for-3.18 http://abf-downloads.rosalinux.ru/rosa2014.1/container/2474193/x86_64/non-free/release/
urpmi kernel-nrj-desktop-3.18.9-1rosa kernel-nrj-desktop-devel-3.18.9-1rosa
Then you can reboot the system and see what happens if it runs kernel 3.18.